- How long does cornstarch last? The precise answer depends to a large extent on storage conditions — to maximize the shelf life of cornstarch, store in a cool, dark cupboard, away from direct heat or sunlight.
To maximize the shelf life of cornstarch, keep the package tightly sealed after opening.
Properly stored, cornstarch will stay safe indefinitely without a loss of quality.
Is cornstarch safe to use after the "expiration" date on the package? Yes, provided it is properly stored and the package is undamaged — commercially packaged cornstarch may carry a "Best By," "Best if Used By," "Best Before," or "Best When Used By" date but this is not a safety date, it is the manufacturer's estimate of how long the cornstarch will remain at peak quality.
Does cornstarch ever spoil? No, commercially packaged cornstarch does not spoil and will remain safe provided it has been stored properly.
Sources: For details about data sources used for food storage information, please click here